The oddest thing about Uranus is that the planet, its rings, and its moons "roll" around the Sun on an axis tilted by more than 90 degrees. The other planets orbit more like spinning tops with their axis pointed more straight up and down. This planet's surface is hidden from our view by a thick layer of cold smog.

Frank Summers, astrophysicist

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Uranus' narrow rings are made of dark, icy boulders. Hard to see directly, they were discovered when Uranus passed in front of a star and the rings blocked the star's light.

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One of the poles of Uranus is always facing the Sun.

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Fact

Uranus rotates on its side so at any time, one of its poles is in sunlight. At the pole, days are 42 Earth years long.

Astronomers think something smashed into Uranus.

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Fact

Uranus may appear to "lie on its side" because a huge meteorite or other body knocked the planet over while it was forming.